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  <section id="cmp0090">
<span id="policy:CMP0090"></span><h1>CMP0090<a class="headerlink" href="#cmp0090" title="Link to this heading">¶</a></h1>
<div class="versionadded">
<p><span class="versionmodified added">Added in version 3.15.</span></p>
</div>
<p><span class="target" id="index-0-command:export"></span><a class="reference internal" href="../command/export.html#package" title="export(package)"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">export(PACKAGE)</span></code></a> does not populate package registry by default.</p>
<p>In CMake 3.14 and below the <span class="target" id="index-1-command:export"></span><a class="reference internal" href="../command/export.html#package" title="export(package)"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">export(PACKAGE)</span></code></a> command populated the
user package registry by default and users needed to set the
<span class="target" id="index-0-variable:CMAKE_EXPORT_NO_PACKAGE_REGISTRY"></span><a class="reference internal" href="../variable/CMAKE_EXPORT_NO_PACKAGE_REGISTRY.html#variable:CMAKE_EXPORT_NO_PACKAGE_REGISTRY" title="CMAKE_EXPORT_NO_PACKAGE_REGISTRY"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_EXPORT_NO_PACKAGE_REGISTRY</span></code></a> to disable it, e.g. in automated
build and packaging environments.  Since the user package registry is stored
outside the build tree, this side effect should not be enabled by default.
Therefore CMake 3.15 and above prefer that <span class="target" id="index-2-command:export"></span><a class="reference internal" href="../command/export.html#package" title="export(package)"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">export(PACKAGE)</span></code></a> does
nothing unless an explicit <span class="target" id="index-0-variable:CMAKE_EXPORT_PACKAGE_REGISTRY"></span><a class="reference internal" href="../variable/CMAKE_EXPORT_PACKAGE_REGISTRY.html#variable:CMAKE_EXPORT_PACKAGE_REGISTRY" title="CMAKE_EXPORT_PACKAGE_REGISTRY"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_EXPORT_PACKAGE_REGISTRY</span></code></a> variable
is set to enable it.  This policy provides compatibility with projects that
have not been updated.</p>
<p>The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior for this policy is for <span class="target" id="index-3-command:export"></span><a class="reference internal" href="../command/export.html#package" title="export(package)"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">export(PACKAGE)</span></code></a> command
to populate the user package registry unless
<span class="target" id="index-1-variable:CMAKE_EXPORT_NO_PACKAGE_REGISTRY"></span><a class="reference internal" href="../variable/CMAKE_EXPORT_NO_PACKAGE_REGISTRY.html#variable:CMAKE_EXPORT_NO_PACKAGE_REGISTRY" title="CMAKE_EXPORT_NO_PACKAGE_REGISTRY"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_EXPORT_NO_PACKAGE_REGISTRY</span></code></a> is enabled.
The <code class="docutils literal notranslate"><span class="pre">NEW</span></code> behavior is for <span class="target" id="index-4-command:export"></span><a class="reference internal" href="../command/export.html#package" title="export(package)"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">export(PACKAGE)</span></code></a> command to do nothing
unless the <span class="target" id="index-1-variable:CMAKE_EXPORT_PACKAGE_REGISTRY"></span><a class="reference internal" href="../variable/CMAKE_EXPORT_PACKAGE_REGISTRY.html#variable:CMAKE_EXPORT_PACKAGE_REGISTRY" title="CMAKE_EXPORT_PACKAGE_REGISTRY"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_EXPORT_PACKAGE_REGISTRY</span></code></a> is enabled.</p>
<p>This policy was introduced in CMake version 3.15.
It may be set by <span class="target" id="index-0-command:cmake_policy"></span><a class="reference internal" href="../command/cmake_policy.html#command:cmake_policy" title="cmake_policy"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">cmake_policy()</span></code></a> or <span class="target" id="index-0-command:cmake_minimum_required"></span><a class="reference internal" href="../command/cmake_minimum_required.html#command:cmake_minimum_required" title="cmake_minimum_required"><code class="xref cmake cmake-command docutils literal notranslate"><span class="pre">cmake_minimum_required()</span></code></a>.
If it is not set, CMake does <em>not</em> warn, and uses <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The <code class="docutils literal notranslate"><span class="pre">OLD</span></code> behavior of a policy is
<span class="target" id="index-0-manual:cmake-policies(7)"></span><a class="reference internal" href="../manual/cmake-policies.7.html#manual:cmake-policies(7)" title="cmake-policies(7)"><code class="xref cmake cmake-manual docutils literal notranslate"><span class="pre">deprecated</span> <span class="pre">by</span> <span class="pre">definition</span></code></a>
and may be removed in a future version of CMake.</p>
</div>
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